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#1 |
Registered User
Join Date: Feb 2016
Location: Louisiana
Posts: 92
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Last time I posted was a ways back its been a long trip and still working on the 72 along with many other projects.
So I have a 04+ 8.1 (without egr) going with Howell engine dev for comp. My 72 has been converted to a 1 ton dually for towing/toy not a DD, I have a nv4500 in the mint or can go the route of a 4L80e. Truck has a th400 in it currently so I am looking for input on best transmission for tow/toy between the 2. I don't think I will leave stock however 500ish+ torque is good enough for me off idle. I have read Dirtylarrys post and he seems to be a wizard at these 8.1L so I hope he chimes in. Money is not problem between the 2 transmissions and what ever one I run with will have a gear vendors. ![]() |
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#2 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,939
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Re: Cannot decide on trans, been a while
4L80E, you won't need the GV unless you want more OD. The TH400 with a GV would be bomb-proof.
![]() Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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#3 |
Senior Member
![]() Join Date: Aug 2004
Location: Centennial, CO
Posts: 2,946
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Re: Cannot decide on trans, been a while
I vote NV4500, but I like to shift it myself.
Really you can’t go wrong either way.
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ClusterTruck: 68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17. 6.0 & TKO http://67-72chevytrucks.com/vboard/s...d.php?t=788602 93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday... 05 Jeep Wrangler Unlimited. 3” lift & 6-speed 02 E320 the insurance total “free car” 13 Tahoe LTZ |
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#4 | |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,483
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Re: Cannot decide on trans, been a while
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Here is how I installed the NV4500 in my '72 Dually: http://67-72chevytrucks.com/vboard/s...d.php?t=673588 A really easy & cheap way to get a heavy duty manual 5 speed overdrive in your truck. You just need to pay attention to what year and vehicle the trans and bell housing are out of..... You won't need the GV unit with this trans. I can pretty much run any speed I want on the interstate with or without the trailer. LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - Last edited by LockDoc; 11-07-2018 at 06:19 PM. |
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#5 |
Registered User
Join Date: Feb 2016
Location: Louisiana
Posts: 92
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Re: Cannot decide on trans, been a while
I'm doing the GV for 3 reasons, 4 over for towing, double OD for when not towing. Already did the calculations for RPM and with the 8.1 with 4.11 it came out perfect.
3rd reason is just to have 9 forward gears total or 8 on the automatic ![]() If I go nv I need to figure out the best flywheel for 12 inch clutch that will work well on the 8.1 (internally balanced) and the pedals. I checked with southbend and they don't have a better input shaft for the 10 spline ![]() |
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#6 | |
Registered User
![]() Join Date: Feb 2007
Location: Star Valley, WY
Posts: 2,038
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Re: Cannot decide on trans, been a while
Quote:
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Steve 1971 GMC Longbox. Full Roller Stroker 489 w/ FiTech EFI, Chris Straub Cam/NV4500/205/D60/14B w. Grizzly Locker and 4.11's. 2" Lift on 33's |
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#7 |
Registered User
Join Date: Jan 2011
Location: Townsend MT
Posts: 1,725
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Re: Cannot decide on trans, been a while
Personally not the biggest fan of the NV4500 due to the 5th gear setup. That, and once you start pushing 800+ ft lbs of torque, 3rd gear can do a good job of shredding teeth. If you have an NV4500, I would use it, but if you have to buy a tranny, I would look into the Spicer 3053a. A fair bit stronger, much cheaper, and it will bolt to your engine if you source the right parts from a C60 or the like and allow you to run a bigger clutch.
Only downside is that O/D is only .85:1 vs the NV4500's .73:1, but that could actually be better with the Gear Vendors as then you would have 2 different overdrive ratios instead of two similar ones (i.e. more usable gears). Gear spacing is also wider (presuming you have a post '94 NV4500) which would be a plus so long as you have the Gear Vendors. |
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#8 |
Senior Member
![]() Join Date: Oct 2009
Location: Godley, TX
Posts: 17,963
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Re: Cannot decide on trans, been a while
Since you're tossin in the 496, have you considered an Allison? That's what they came with (if ordered with an auto).
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#9 | |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,483
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Re: Cannot decide on trans, been a while
Quote:
That's what I have behind my 2003 8.1. I also have a Workhorse 8.1 with the Allison 2350 MH six-speed automatic with lock up bolted to it, out of a motor home. LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#10 | |
Registered User
Join Date: Feb 2016
Location: Louisiana
Posts: 92
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Re: Cannot decide on trans, been a while
Quote:
So looking at your thread there Doc. https://www.advanceadapters.com/prod...llhousing-kit/ https://www.pricefalls.com/product/c...d=184105378733 still getting list together. Last edited by Thanos; 11-08-2018 at 11:15 AM. |
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#11 | |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,483
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Re: Cannot decide on trans, been a while
Quote:
I used the stock '72 bell housing and all of the stock clutch parts for my install. All that trick stuff is too rich for my blood.... ![]() LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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